Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

10 hosts · 368 ms

HostCertsFirst seenLast seenDNS
joinbigeasy.com 7 2026-05-06 2026-09-05 ok
email.lc.joinbigeasy.com 5 2026-05-24 2026-09-20 ok
intake.joinbigeasy.com 2 2026-10-01 2026-10-01 nxdomain
dev-intake.joinbigeasy.com 3 2026-06-22 2026-08-23 ok
portal.joinbigeasy.com 16 2026-05-18 2026-09-30 ok
admin.joinbigeasy.com 6 2026-05-17 2026-09-20 ok
email.mas.joinbigeasy.com 3 2026-07-14 2026-09-12 ok
start.joinbigeasy.com 5 2026-05-18 2026-09-23 ok
www.joinbigeasy.com 5 2026-05-06 2026-09-05 ok
pay.joinbigeasy.com 3 2026-04-02 2026-08-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/joinbigeasy.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/joinbigeasy.com.